1. Lecture 1 Chapter 1. Descriptive Statistics  This chapter is about summarizing and describing data.  Lets have a look at some data....  An experiment was set up to measure the selenium content of three different types of meat in a region of the United States.  The meats of interest in this region are: Venison; Squirrel; Beef. Venison; Squirrel; Beef.  The units are micrograms (µg) per 100g dry weight…

2. Venison: 26.72 28.58 29.71 26.95 10.97 21.97 14.35 32.21 19.19 26.72 28.58 29.71 26.95 10.97 21.97 14.35 32.21 19.19 30.92 10.42 35.49 36.84 25.03 33.59 14.86 16.47 25.19 30.92 10.42 35.49 36.84 25.03 33.59 14.86 16.47 25.19 37.45 45.08 25.22 22.11 33.01 31.20 26.50 32.77 8.70 37.45 45.08 25.22 22.11 33.01 31.20 26.50 32.77 8.70 25.90 29.80 37.63 33.74 18.02 22.27 26.10 20.89 29.44 25.90 29.80 37.63 33.74 18.02 22.27 26.10 20.89 29.44 21.69 21.49 18.11 31.50 27.36 21.33 21.69 21.49 18.11 31.50 27.36 21.33Squirrel: 37.42 56.46 51.91 62.73 4.55 39.17 38.44 40.92 58.93 37.42 56.46 51.91 62.73 4.55 39.17 38.44 40.92 58.93 61.88 49.54 64.35 82.49 38.54 39.53 37.57 25.71 23.97 61.88 49.54 64.35 82.49 38.54 39.53 37.57 25.71 23.97 13.82 42.21 35.88 10.54 27.97 41.89 23.94 49.81 30.71 13.82 42.21 35.88 10.54 27.97 41.89 23.94 49.81 30.71 50.00 87.50 68.99 50.00 87.50 68.99Beef: 11.23 29.63 20.42 10.12 39.91 32.66 38.38 36.21 16.39 11.23 29.63 20.42 10.12 39.91 32.66 38.38 36.21 16.39 27.44 17.29 56.20 28.94 20.11 25.35 15.82 27.74 22.35 27.44 17.29 56.20 28.94 20.11 25.35 15.82 27.74 22.35 34.78 35.09 32.60 37.03 27.00 44.20 13.09 33.03 9.69 34.78 35.09 32.60 37.03 27.00 44.20 13.09 33.03 9.69 32.45 37.38 34.91 21.77 31.62 32.63 30.31 46.16 56.61 32.45 37.38 34.91 21.77 31.62 32.63 30.31 46.16 56.61 24.47 29.39 40.71 18.52 27.80 19.49 27.99 22.36 22.68 24.47 29.39 40.71 18.52 27.80 19.49 27.99 22.36 22.68 26.52 46.01 38.04 30.88 30.04 25.91 18.54 25.51 26.52 46.01 38.04 30.88 30.04 25.91 18.54 25.51

3.  Can we easily compare the selenium levels of the three meats by just looking at the numbers?  No! The numbers themselves are not particularly helpful.  It helps to summarize or picture the data.

4.  E.g. histograms for each meat help us see the relative distributions of selenium content.  Let’s see how the computer package Minitab can produce these for us....